Part Number: AM4377
Hello,
I am working on a custom board using the AM4377, based on the IDK437x. I am using the SDK ti-processor-sdk-linux-rt-am437x-evm-08.02.00.24.
We have a RTC RV8803 installed on the bus I2C, at the address 0x65. When in u-boot, the chip can be detected:
=> i2c bus 0 Bus 0: i2c@44e0b000 (active 0) 65: cdce913@65, offset len 1, flags 0 24: generic_24, offset len 1, flags 0
=> i2c dev 0 Setting bus to 0 => i2c probe 0x65 Valid chip addresses:
In the DTB file of the kernel, the access to the chip is defined as:
&am43xx_pinmux {
i2c0_pins_default: i2c0_pins_default {
pinctrl-single,pins = <
AM4372_IOPAD(0x988, PIN_INPUT | SLEWCTRL_FAST | MUX_MODE0) /* i2c0_sda.i2c0_sda */
AM4372_IOPAD(0x98c, PIN_INPUT | SLEWCTRL_FAST | MUX_MODE0) /* i2c0_scl.i2c0_scl */
>;
};
i2c0_pins_sleep: i2c0_pins_sleep {
pinctrl-single,pins = <
AM4372_IOPAD(0x988, PIN_INPUT_PULLDOWN | MUX_MODE7)
AM4372_IOPAD(0x98c, PIN_INPUT_PULLDOWN | MUX_MODE7)
>;
};
(...)
};
&i2c0 {
status = "okay";
pinctrl-names = "default", "sleep";
pinctrl-0 = <&i2c0_pins_default>;
pinctrl-1 = <&i2c0_pins_sleep>;
clock-frequency = <400000>;
rv8803: rtc@65 {
compatible = "microcrystal,rv8803";
reg = <0x65>;
};
(...)
};
I included the kernel driver for this RTC:
CONFIG_RTC_DRV_RV8803=m
I recompiled the driver and the dtb files and installed them on the custom platform.
But on start up, there is no trace about the RTC driver, nor any device /dev/rtc1 (/dev/rtc0 is defined as the internal rtc of the Sitara).
I tried to probe the i2c bus from the user space, but with inconclusive results:
root@am437x-evm:~# i2cdetect -y 0
Warning: Can't use SMBus Quick Write command, will skip some addresses
0 1 2 3 4 5 6 7 8 9 a b c d e f
00:
10:
20:
30: -- -- 32 -- -- -- -- --
40:
50: 50 -- -- -- -- -- -- -- 58 -- -- -- -- -- -- --
60:
70:
My end goal is to have access to the RV8803 using /dev/rtc1. Do you have any clue what is missing on my system?
Thank you
Best regards,
Frederic.
